【发布时间】：2017-04-05 20:56:25
【问题描述】：
如何将十六进制字符串值传递给我的 .ashx 页面，我在 System.Drawing.Color 中需要它
如果我传递一个普通的字符串，例如：
string name="John"
一切正常。
但如果我尝试传递十六进制值，例如：
string bg_color ="#000000"
.ashx 页面上的字符串为空或“”
已经尝试只传递不带# 的值，这确实有效。但是，如果我稍后添加 # 之类的：
Color _bgClr = ColorTranslator.FromHtml(string.Format{"#{0}", text_background_color);
当我尝试在我的网络表单上更改 HEX（背景值）时，我收到 # is invalid parameter 错误。
有什么线索吗？
请帮忙
更新
<img class="link-realtime1" src="ImageGen.ashx?bo=<%=inp_barva_ozadja.Text %>&bt=<%=inp_barva_teksta.Text %>" style="float: left;margin-top: -20px;"/>
UPDATE2 - .aspx
<form id="image_generator" runat="server">
<div class="main">
<div class="controls">
<div class="options" style="float: left;width: 50%;">
<label>
<span>Širina</span>
<asp:TextBox ID="inp_sirina" Width="125" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_s" runat="server"></asp:Literal></span><br />
<label>
<span>Višina</span>
<asp:TextBox ID="inp_visina" Width="125" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_v" runat="server"></asp:Literal></span><br />
<label>
<span>Tekst</span>
<asp:TextBox ID="inp_text" Width="125" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_t" runat="server"></asp:Literal></span><br />
<label>
<span>Velikost pisave</span>
<asp:TextBox ID="inp_velikost" Width="125px" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_vp" runat="server"></asp:Literal></span><br />
<label>
<span>Barva ozadja</span>
<asp:TextBox ID="inp_barva_ozadja" Width="125px" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_bo" runat="server"></asp:Literal></span><br />
<label>
<span>Barva teksta</span>
<asp:TextBox ID="inp_barva_teksta" Width="125px" runat="server"></asp:TextBox>
</label><span style="color:red"><asp:Literal ID="napaka_bt" runat="server"></asp:Literal></span><br />
<div id="colorpicker"></div><br />
<script type="text/javascript">
$(document).ready(function () {
$('#colorpicker').farbtastic('#inp_barva_ozadja');
});
</script>
<a class="link-realtime" href="ImageGen.ashx?w=<%= inp_sirina.Text %>&h=<%= inp_visina.Text %>&t=<%= inp_text.Text %>&ts=<%= inp_velikost.Text %>&bg=<%= inp_barva_ozadja.Text %>&tc=<%= inp_barva_teksta.Text %>">Generiraj sliko</a><br />
</div>
<script type="text/javascript">
$('#inp_sirina, #inp_visina, #inp_barva_ozadja, #inp_barva_teksta, #inp_text, #inp_velikost').keyup(function () {
var tekst1 = $('#inp_sirina').val();
var tekst2 = $('#inp_visina').val();
var tekst3 = $('#inp_text').val();
var v_pisave = $('#inp_velikost').val();
var barva1 = $('#inp_barva_ozadja').val();
var barva2 = $('#inp_barva_teksta').val();;
var path = "ImageGen.ashx?w=" + tekst1 + "&h=" + tekst2 + "&t=" + tekst3 + "&ts=" + v_pisave + "&bg=" + barva1 + "&tc=" + barva2;
$("a.link-realtime").attr("href", path);
$("img.link-realtime1").attr("src", path);
});
</script>
<div id="output">
<span class="output-result"></span></br>
<img class="link-realtime1" src="ImageGen.ashx?w=<%= inp_sirina.Text %>&h=<%= inp_visina.Text %>&t=<%= inp_text.Text %>&ts=<%= inp_velikost.Text %>&bo=<%=inp_barva_ozadja.Text %>&bt=<%=inp_barva_teksta.Text %>" style="float: left;margin-top: -20px;"/>
</div></br>
</div>
</div>
</form>
UPDATE3 - .ashx
public void ProcessRequest(HttpContext context)
{
string _width = context.Request.QueryString["w"];
int __width = Convert.ToInt32(_width);
string _height = context.Request.QueryString["h"];
int __height = Convert.ToInt32(_height);
string text = context.Request.QueryString["t"];
string text_size = context.Request.QueryString["ts"];
int _text_size = Convert.ToInt32(text_size);
/*string text_background_color = context.Request.QueryString["bo"];*/
string text_background_color = "#000000";
Color _bgClr = ColorTranslator.FromHtml(text_background_color);
/*Color _bgClr = ColorTranslator.FromHtml(string.Format("{0}", "#" + text_background_color));*/
/*string text_color = context.Request.QueryString["bt"];*/
string text_color = "#FFFFFF";
Color _txtClr = ColorTranslator.FromHtml(text_color);
Bitmap slika = new Bitmap(1, 1);
float koordinataX = (__width / 2) - (((__width / 2) / 2) / 2);
float koordinataY = (__height / 2);
if (koordinataX < 50)
{
_text_size = _text_size / 2;
}
text = Regex.Replace(text, "(.{" + 20 + "})", "$1" + Environment.NewLine);
Font pisava = new Font("Verdana", _text_size, FontStyle.Bold, GraphicsUnit.Point);
Graphics graphics = Graphics.FromImage(slika);
slika = new Bitmap(slika, new Size(__width, __height));
graphics = Graphics.FromImage(slika);
graphics.Clear(_bgClr);
graphics.TextRenderingHint = TextRenderingHint.AntiAlias;
using (var sf = new StringFormat()
{
Alignment = StringAlignment.Center,
LineAlignment = StringAlignment.Center
})
{
graphics.DrawString(text, pisava, new SolidBrush(_txtClr), new Rectangle(0, 0, slika.Width, slika.Height), sf);
}
/*graphics.DrawString(text, pisava, new SolidBrush(_txtClr), koordinataX, koordinataY);*/
MemoryStream ms = new MemoryStream();
slika.Save(ms, ImageFormat.Png);
byte[] bajt = ms.ToArray();
context.Response.ContentType = "image/png";
context.Response.BinaryWrite(bajt);
context.Response.Flush();
}
【问题讨论】：
-
您是否尝试过将参数
bg_color传递给.ashx 的url 编码？ -
如果 url 编码与我所做的不同（请参阅更新），请您在我的表单上发布示例@BobDust